<template>
          <div class="todo-header">
                    <input type="text" 
                    v-model="newTaskName" 
                    @keyup.enter="addNewTask" 
                    placeholder="请输入新的任务名称，按回车键确认" />

                </div>
</template>

<script>
import { nanoid } from 'nanoid'
export default {
    name:'TaskHeader',
    data() {
        return {
            newTaskName:""
        }
    },
    methods: {
        addNewTask(){
            if (this.newTaskName.trim()==='') {
                alert(' 数据不合法，请重新录入');
                this.newTaskName='';
                return;
            }
            let newTaskObj ={
              id:nanoid(),taskName:this.newTaskName,done:false
      
           }
                this.addTask(newTaskObj);
                this.newTaskName=''
        }
    },
     props:['addTask'],
}
</script>

<style  scoped>
.todo-header input {
  width: 560px;
  height: 28px;
  font-size: 14px;
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 4px 7px;
}

.todo-header input:focus {
  outline: none;
  border-color: rgba(82, 168, 236, 0.8);
  box-shadow: inset 0 1px 1px rgba(0, 0, 0, 0.075), 0 0 8px rgba(82, 168, 236, 0.6);
}
</style>>


